Christian
Topic Author
Posts: 323
Joined: Sun Oct 17, 1999 1:38 am

Landing Gear Speed

Sat May 21, 2005 2:29 am

What is the maximum speeds to lower the landing gear on the B-777 and the B-747-400.

I apologies if this have been discussed before, but I have search, and couldn't fin anything.

/Christian
If your pictures aren’t good enough, you’re not close enough
 
PhilSquares
Posts: 3371
Joined: Sun Mar 28, 2004 6:06 pm

RE: Landing Gear Speed

Sat May 21, 2005 3:53 am

The 400 is 270 KIAS/.82M for gear extension or retraction. 320/.82M for gear down.
Fly fast, live slow
 
2H4
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Joined: Tue Oct 19, 2004 11:11 pm

RE: Landing Gear Speed

Sat May 21, 2005 2:30 pm

....From the internet, so I'm not guaranteeing accuracy here...

777-300:

VLO - Maximum Gear Operating Speed 270 KIAS/.82 Mach

VLE - Maximum Landing Gear Extension Speed 270 KIAS/.82 Mach


2H4


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tinpusher007
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RE: Landing Gear Speed

Sat May 21, 2005 7:25 pm

Quoting PhilSquares (Reply 1):
The 400 is 270 KIAS/.82M for gear extension or retraction. 320/.82M for gear down.

Why is there a second speed for gear down? If you extend the gear, isn't it down? Can this really be done at Mach .82? Or should I focus more on the Indicated Airspeed instead of the Mach number?
"Flying isn't inherently dangerous...but very unforgiving of carelessness, incapacity or neglect."
 
PhilSquares
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RE: Landing Gear Speed

Sat May 21, 2005 9:05 pm

If you are doing an emergency descent from 370 or so, your mach will be .85-.86 while your indicated will be around 240 or so. In that case, you have to slow to .82 or less.

At lower altitudes, the indicated speed becomes a factor.
Fly fast, live slow
 
Christian
Topic Author
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Joined: Sun Oct 17, 1999 1:38 am

RE: Landing Gear Speed

Sat May 21, 2005 9:22 pm

Thanks alot for the answers

/Christian
If your pictures aren’t good enough, you’re not close enough
 
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longhauler
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RE: Landing Gear Speed

Sat May 21, 2005 9:30 pm

Quoting TinPusher007 (Reply 3):
Why is there a second speed for gear down? If you extend the gear, isn't it down?

The gear operating speeds, (extension and retraction) are always less then the gear extended (down and locked) speed. This is due to the landing gear door restrictions as the doors open, gear extends or retracts, then close again. Once the gear doors are closed, you may then fly at a higher speed, with the gear extended.
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